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2016 Map of East Portal

Name: 2016 Topographic Map of East Portal
Creator: U.S. Geological Survey
Published: 2016
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2016

About this map

The Continental Divide defines the high-altitude geography of this region at the border of Arapaho National Forest and Roosevelt National Forest. The map documents a critical corridor of transcontinental transportation history, featuring the Moffat Tunnel as it enters the mountain at East Portal. This engineering feat bypassed the treacherous climb over Rollins Pass, though the historic Moffat Road and the Boulder Wagon road remain visible as they navigate the steep terrain toward the Needle Eye Tunnel.

High alpine hydrology is a primary feature, with numerous glacial catchments such as Jasper Lake, Diamond Lake, and Corona Lake feeding the headwaters of Ranch Creek and South Boulder Creek. The survey also marks the prominent Devils Thumb and Mt Jasper summits, alongside specialized mountain infrastructure like the Riflesight Notch and its associated Trestle Trail, providing a detailed look at the interface between rugged wilderness and industrial rail history.